Driveline noise since the lift.

[ktmrider]

I have an audible low grade thump or knock that starts at about 50 mph and it goes away completely if you lift the throttle and let it coast. From what I can see the u-joints seem ok and its not like a noise you would hear with a bad rear end bearing. Seems to get better the longer you drive. I don't remember hearing it before the lift but I drove it very little before. Since its my first Liberty I'm not sure just how much driveline noise there is. It also sounds like its coming from the front, but with driveline noise its hard to pinpoint. I am driving in 2wd and you hear nothing until 50 mph. This Jeep sat up for over a year also.

 

[CzarKJ]

I have an audible low grade thump or knock that starts at about 50 mph and it goes away completely is you lift the throttle and let it coast. From what I can see the u-joints seem ok and its not like a noise you would hear with a bad rear end bearing. Seems to get better the longer you drive. I don't remember hearing it before the lift but I drove it very little before. Since its my first Liberty I'm not sure just how much driveline noise there is. It also sounds like its coming from the front, but with driveline noise its hard to pinpoint. I am driving in 2wd and you hear nothing until 50 mph. This Jeep sat up for over a year also.

Did you check the CVs on the front driveshaft? Make sure the boots are ok. Also check the right and left half shafts for the same thing.

 

[ktmrider]

Did you check the CVs on the front driveshaft? Make sure the boots are ok. Also check the right and left half shafts for the same thing.

From visual inspections the boots are intact and it seems tight. Would the front DS be under a load in 2WD?

 

[Hedsic]

Check the front drive shaft to see if the boot is torn or shredded at all. That is usually the case when these symptoms arrise.

Nevermind, I'm just really slow at posting lol

 

[ktmrider]

Check the front drive shaft to see if the boot is torn or shredded at all. That is usually the case when these symptoms arrise.

Nevermind, I'm just really slow at posting lol

You know I remember there being yellow marks on the front DS...like it came from a salvage yard. It looks like its in good shape.

 

[ktmrider]

Guess it would be easy enough to remove the front DS and see if the noise goes away.

 

[tommudd]

Rear boot on front driveshaft if gone could be issue due to CV then going bad, easy to remove front driveshaft and see what it does
If new CV needed 55-60 bucks and 10 minutes time after shaft is out
Next would be the right front CV/ Intermediate shaft
then also rear ujoints
You have changed both the front CV angles and rear driveshaft so while they were OK before ( although worn) now with angle changes are showing up with issues
Front CV/ Intermediate shaft the splines wear and cause issues
The ujoints in the rear driveshaft can be worn out and still feel good and tight. Mine at 50,000 miles were rusted solid almost. Chased a vibration on and off for 2000 miles, finally rolled under it one day and laid my hand on the rear joint and it was red hot.

Anyways a few things to check

 

[ktmrider]

Tom would pulling the front DS help pinpoint the problem? At least as to whether is front or rear?

 

[tommudd]

Tom would pulling the front DS help pinpoint the problem? At least as to whether is front or rear?

It would only eliminate the front driveshaft issues ( if there are any)
Could still have the intermediate shaft/ CV noise
But its worth pulling it out just to see

 

[CactusJacked]

It being the front driveshaft would be an awful strange coincidence right after a lift, since a lift changes nothing on that shafts angle. My intermediate shaft was badly worn (pic of my new vs old below), and the cv hub was allowed to flop on the shaft making a clunk clunk clunk. Take a look at the passenger side inboard axle hub and see if it looks like it's laying at a downward angle compared to the housing. It will be if the intermediate shaft is shot.

You must be registered for see images attach

 

[Hedsic]

It being the front driveshaft would be an awful strange coincidence right after a lift, since a lift changes nothing on that shafts angle. My intermediate shaft was badly worn (pic of my new vs old below), and the cv hub was allowed to flop on the shaft making a clunk clunk clunk. Take a look at the passenger side inboard axle hub and see if it looks like it's laying at a downward angle compared to the housing. It will be if the intermediate shaft is shot.

You must be registered for see images attach

Sometimes lifting it helps bring the noise out so you can hear it more. Raises the jeep off the ground so the sound has a better chance of carrying. That might be the case here.

 

[tommudd]

My dime is on the Intermediate Shaft as well
BUT
front driveshaft just takes a few minutes to drop out and needs to be checked anyways since more than likely the boot is either gone or going on it

 

[jeeptorino68]

i got under my jeep tonight, been having some noises (rotational noises, not a thump or tick, but just a rotational rubbing type noise...) i put my hand on the end of the intermediate shaft and i could move it a bit in all directions. should there be any movement at this point at all?

 

[ktmrider]

The more I drive it the quieter its getting. So I'm not to motivated to start tearing things apart just yet. Some of it will get addressed later on anyway. I'm going to put it back on a lift and see if there is anything obvious. I may go ahead and drop that front DS but other than that I'm going to wait.

 

[CactusJacked]

If you drop the front driveshaft, take it for a ride then and listen to see whether the noise is gone or not.

 

[ktmrider]

So upon closer inspection that boot on the driveshaft at the transfer case is not only torn, its gone. I can see the balls in the CV joint. So I guess one of the CV repair kits looks like the most cost effective solution. The passenger side CV axle seems pretty tight. I see there are some U-joint conversions for that DS. Any reason to not go back with the original setup?

 

[tommudd]

So upon closer inspection that boot on the driveshaft at the transfer case is not only torn, its gone. I can see the balls in the CV joint. So I guess one of the CV repair kits looks like the most cost effective solution. The passenger side CV axle seems pretty tight. I see there are some U-joint conversions for that DS. Any reason to not go back with the original setup?

Simplest and easiet just to replace the CV on the original one and be done, cheap and easy .
UJoint conversions usually have some vibrations, PLUS you have to remove to grease if you use greaseable ujoints